EL4421C 22C 41C 42C 43C 44C
Multiplexed-Input Video Amplifiers
Typical Performance Curves
Supply Current vs
Supply Voltage
Contd
Supply Current vs
Temperature
8-Pin Package
Power Dissipation vs
Ambient Temperature
4421 – 31
14-Pin Package
Power Dissipation vs
Ambient Temperature
4421 – 32
4421 – 33
4421 – 34
Applications Information
General Description
The EL44XX family of video mux-amps are com-
posed of two or four input stages whose inputs
are selected and control an output stage One of
the inputs is active at a time and the circuit be-
haves as a traditional voltage-feedback op-amp
for that input rejecting signals present at the un-
selected inputs Selection is controlled by one or
two logic inputs
The EL4421 EL4422 EL4441 and EL4442 have
all
b
inputs wired in parallel allowing a single
feedback network to set the gain of all inputs
These devices are wired for positive gains The
EL4443 and EL4444 on the other hand have all
a
inputs and
b
inputs brought out separately so
that the input stage can be wired for independent
gains and gain polarities with separate feedback
networks
The EL4421 EL4441 and EL4443 are compen-
sated for unity-gain stability while the EL4422
EL4442 and EL4444 are compensated for a fed-
back gain of
a
2 ideal for driving back-terminat-
ed cables or maintaining bandwidth at higher
fed-back gains
9
ELANTEC [ ELANTEC SEMICONDUCTOR ]
